Crestless Curassow (Mitu tomentosum)

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Image of a Crestless Curassow in its natural habitat
Birds Curassow

Introduction

The Crestless Curassow (Mitu tomentosum) is a large, mainly terrestrial member of the Cracidae family, which includes curassows, guans and chachalacas. It occurs in the northern Amazon and adjacent Orinoco regions of Brazil, Colombia, Guyana and Venezuela. The species is associated chiefly with humid lowland forest, particularly riverine and gallery forest with dense undergrowth.

Physical Description

The Crestless Curassow is approximately 75–85 centimetres long. Adults are predominantly black, with a dark blue or purplish gloss to the plumage. The belly and the tip of the tail are rich chestnut, while the bill and legs are reddish.

Unlike several related curassows, it has no prominent crest and lacks the swollen casque or knob at the base of the bill. Males and females are similarly coloured, but males are generally heavier. Reported adult weights range from about 2.3–3.05 kilograms for males and 1.3–2.43 kilograms for females. Reliable information on age-related plumage differences is limited.

Range and Habitat

The Crestless Curassow is distributed in eastern Colombia, southern Venezuela, south-western Guyana and north-western Brazil. It is a non-migratory species of lowland South America.

It mainly inhabits humid tropical rainforest along rivers, including seasonally flooded areas, and also occurs in gallery forest within the llanos of Colombia and Venezuela. Dense understorey is an important feature of its habitat. The species has been recorded to approximately 500 metres in Colombia and 600 metres in Venezuela, although most records are from low elevations.

Behaviour and Diet

The Crestless Curassow is generally diurnal and forages mostly on the ground. It is usually encountered alone or in pairs, although small groups of up to about 10 birds have occasionally been reported. Its flight is likely to be relatively short and limited, reflecting its predominantly terrestrial habits.

The diet has not been studied in detail, but available accounts indicate that fallen fruit forms the main food source. Seeds and other plant material may also be taken. By consuming fruit and moving through forest, the species may contribute to seed dispersal, although the scale of this ecological role has not been quantified specifically for the Crestless Curassow.

Breeding information is limited. Breeding activity appears to increase during the rainy season. The nest is placed low in a tree, and the usual clutch is reported to contain two eggs. Details of incubation, chick development and parental care remain poorly documented.

Identification Tips

Look for the following combination of features when identifying a Crestless Curassow:

  • A large, mostly black curassow with a dark blue or purplish sheen.
  • Rich chestnut colouring on the belly and the tip of the tail.
  • A smooth red bill without a casque or basal swelling.
  • No conspicuous crest.
  • Red legs and a preference for walking on the forest floor, often near rivers or in dense undergrowth.

The chestnut belly and chestnut tail tip help separate it from Salvin’s Curassow (Mitu salvini), which has a white belly and a white tail tip. Razor-billed Curassow (Mitu tuberosum) is generally larger-billed and has a prominent swollen bill structure or casque. Calls may be easier to detect than the bird itself and include a low humming or booming song, as well as sharper alarm notes.

Conservation Status

The Crestless Curassow is currently assessed as Least Concern on the IUCN Red List. A global population estimate is not available in the sources used for this article.

Despite its relatively broad distribution, the species is affected locally by habitat loss and fragmentation caused by forest clearance, agriculture, logging and infrastructure development. Hunting is also a concern, particularly because curassows are large ground-dwelling birds that may be targeted as game. The species’ conservation depends on maintaining connected lowland forests, protecting riverine and gallery habitats, monitoring populations and reducing unsustainable hunting within its range.

Frequently Asked Questions

Where does the Crestless Curassow live?

It occurs in eastern Colombia, southern Venezuela, south-western Guyana and north-western Brazil, mainly in humid lowland forests near rivers and in gallery forest.

What does the Crestless Curassow look like?

It is a large, mostly black curassow with a dark glossy sheen, a chestnut belly and chestnut tail tip, a smooth red bill and red legs. It has no prominent crest.

What does the Crestless Curassow eat?

Its diet is not well studied, but fallen fruit is reported to make up most of its food. It may also consume seeds and other plant material.

Is the Crestless Curassow endangered?

The species is currently classified as Least Concern globally by the IUCN. Local populations may nevertheless be affected by hunting, habitat loss and forest fragmentation.

How does the Crestless Curassow behave?

It is mainly diurnal and terrestrial, usually foraging alone or in pairs on the forest floor. It is secretive and is often detected by its low booming call rather than seen clearly.

How many eggs does it lay?

The usual clutch is reported to contain two eggs. Nesting information remains limited, but nests are placed low in trees and breeding appears to coincide with the rainy season.

References

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